PHASE 1B STUDY OF PEMBROLIZUMAB IN PATIENTS WITH RELAPSED/REFRACTORY PRIMARY MEDIASTINAL LARGE B‐CELL LYMPHOMA (RRPMBCL): UPDATED RESULTS FROM THE KEYNOTE‐013 TRIAL. (June 2017) - Zinzani, P.; Ribrag, V.; Moskowitz, C.H.; Michot, J.; Kuruvilla, J.; Bartlett, N.; Balakumaran, A.; Chatterjee, A.; Chlosta, S.; Shipp, M.A.; Armand, P.